Based on the answers provided, the following corrections need to be made to the 3D object:

1. Modify the object to resemble a typical Lego block. This would involve replacing the two cylindrical protrusions on the top with multiple connecting studs that are characteristic of Lego blocks. 

2. Ensure that the cylinders on top of the block are each 1/4th the size of the rectangular prism. This may require adjusting the size of the cylinders or the base to achieve the correct proportions.